linux/include/trace/events/rv.h
Daniel Bristot de Oliveira ccc319dcb4 rv/monitor: Add the wwnr monitor
Per task wakeup while not running (wwnr) monitor.

This model is broken, the reason is that a task can be running in the
processor without being set as RUNNABLE. Think about a task about to
sleep:

1:      set_current_state(TASK_UNINTERRUPTIBLE);
2:      schedule();

And then imagine an IRQ happening in between the lines one and two,
waking the task up. BOOM, the wakeup will happen while the task is
running.

Q: Why do we need this model, so?
A: To test the reactors.

Link: https://lkml.kernel.org/r/473c0fc39967250fdebcff8b620311c11dccad30.1659052063.git.bristot@kernel.org

Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2022-07-30 14:01:30 -04:00

143 lines
3.6 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM rv
#if !defined(_TRACE_RV_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_RV_H
#include <linux/rv.h>
#include <linux/tracepoint.h>
#ifdef CONFIG_DA_MON_EVENTS_IMPLICIT
DECLARE_EVENT_CLASS(event_da_monitor,
TP_PROTO(char *state, char *event, char *next_state, bool final_state),
TP_ARGS(state, event, next_state, final_state),
TP_STRUCT__entry(
__array( char, state, MAX_DA_NAME_LEN )
__array( char, event, MAX_DA_NAME_LEN )
__array( char, next_state, MAX_DA_NAME_LEN )
__field( bool, final_state )
),
TP_fast_assign(
memcpy(__entry->state, state, MAX_DA_NAME_LEN);
memcpy(__entry->event, event, MAX_DA_NAME_LEN);
memcpy(__entry->next_state, next_state, MAX_DA_NAME_LEN);
__entry->final_state = final_state;
),
TP_printk("%s x %s -> %s %s",
__entry->state,
__entry->event,
__entry->next_state,
__entry->final_state ? "(final)" : "")
);
DECLARE_EVENT_CLASS(error_da_monitor,
TP_PROTO(char *state, char *event),
TP_ARGS(state, event),
TP_STRUCT__entry(
__array( char, state, MAX_DA_NAME_LEN )
__array( char, event, MAX_DA_NAME_LEN )
),
TP_fast_assign(
memcpy(__entry->state, state, MAX_DA_NAME_LEN);
memcpy(__entry->event, event, MAX_DA_NAME_LEN);
),
TP_printk("event %s not expected in the state %s",
__entry->event,
__entry->state)
);
#ifdef CONFIG_RV_MON_WIP
DEFINE_EVENT(event_da_monitor, event_wip,
TP_PROTO(char *state, char *event, char *next_state, bool final_state),
TP_ARGS(state, event, next_state, final_state));
DEFINE_EVENT(error_da_monitor, error_wip,
TP_PROTO(char *state, char *event),
TP_ARGS(state, event));
#endif /* CONFIG_RV_MON_WIP */
#endif /* CONFIG_DA_MON_EVENTS_IMPLICIT */
#ifdef CONFIG_DA_MON_EVENTS_ID
DECLARE_EVENT_CLASS(event_da_monitor_id,
TP_PROTO(int id, char *state, char *event, char *next_state, bool final_state),
TP_ARGS(id, state, event, next_state, final_state),
TP_STRUCT__entry(
__field( int, id )
__array( char, state, MAX_DA_NAME_LEN )
__array( char, event, MAX_DA_NAME_LEN )
__array( char, next_state, MAX_DA_NAME_LEN )
__field( bool, final_state )
),
TP_fast_assign(
memcpy(__entry->state, state, MAX_DA_NAME_LEN);
memcpy(__entry->event, event, MAX_DA_NAME_LEN);
memcpy(__entry->next_state, next_state, MAX_DA_NAME_LEN);
__entry->id = id;
__entry->final_state = final_state;
),
TP_printk("%d: %s x %s -> %s %s",
__entry->id,
__entry->state,
__entry->event,
__entry->next_state,
__entry->final_state ? "(final)" : "")
);
DECLARE_EVENT_CLASS(error_da_monitor_id,
TP_PROTO(int id, char *state, char *event),
TP_ARGS(id, state, event),
TP_STRUCT__entry(
__field( int, id )
__array( char, state, MAX_DA_NAME_LEN )
__array( char, event, MAX_DA_NAME_LEN )
),
TP_fast_assign(
memcpy(__entry->state, state, MAX_DA_NAME_LEN);
memcpy(__entry->event, event, MAX_DA_NAME_LEN);
__entry->id = id;
),
TP_printk("%d: event %s not expected in the state %s",
__entry->id,
__entry->event,
__entry->state)
);
#ifdef CONFIG_RV_MON_WWNR
/* id is the pid of the task */
DEFINE_EVENT(event_da_monitor_id, event_wwnr,
TP_PROTO(int id, char *state, char *event, char *next_state, bool final_state),
TP_ARGS(id, state, event, next_state, final_state));
DEFINE_EVENT(error_da_monitor_id, error_wwnr,
TP_PROTO(int id, char *state, char *event),
TP_ARGS(id, state, event));
#endif /* CONFIG_RV_MON_WWNR */
#endif /* CONFIG_DA_MON_EVENTS_ID */
#endif /* _TRACE_RV_H */
/* This part ust be outside protection */
#undef TRACE_INCLUDE_PATH
#include <trace/define_trace.h>